for libs that use libc, ensure they do not depend on too-recent glibc

From bruen...@google.com on August 08, 2014 10:10:23

"For some reason, lib64/libdrinjectlib.so (from the prebuilt binary package) uses memcpy@GLIBC_2.14 -- and thus it doesn't run on older Linux distributions, like RHEL6.4."

xref issue #1334 xref drmem-issue #344

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=1504